Re: [PHP-DEV] Bug #10829: call_user_func() - Bug From: Sterling Hughes (sterling <email protected>)
Date: 05/12/01

Thies C. Arntzen wrote:

> On Sat, May 12, 2001 at 02:23:44PM -0000, stefan <email protected> wrote:
>
>>From: stefan <email protected>
>>Operating system: Win2K, Solaris
>>PHP version: 4.0.5
>>PHP Bug Type: Scripting Engine problem
>>Bug description: call_user_func() - Bug
>>
>>Hi,
>>
>>I have found the following bug with the function call_user_func():
>>
>>If the user function you are trying to call with 'call_user_func' requires any of its parameters to be passed by reference, PHP issues a warning stating that the function doesn't exist.
>>
>>Example:
>>
>><?php
>>function testme(&$param) {
>> var_dump($param);
>>}
>>
>>$func = "testme";
>>$param = array(1, 2);
>>
>>call_user_func($func, $param);
>>
>>?>
>>
>>Result:
>>
>><br>
>><b>Warning</b>: Unable to call testme() - function does not exist in <b>t.php</b> on line <b>1</b><br>
>>
>
> if you take out the & in the testme argument list it works -
> even weirder.
>

Actually, it doesn't seem that wierd to me ;)

the call_user_func() expects an array of parameters, therefore, the
correct code would look like:

$func = "testme";
$param = array(1, 2);

call_user_func($func, array($param));

But instead the code passes a constant value "1" to the first argument,
and "1" cannot be passed by reference. The error generated is kinda a
bug, call_user_func() should emit a more general error message, but
otherwise its not a real bug.

-Sterling 

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